Riley was half-hard by the time that Tao closed his lips over his length, so when the vampire began his ministrations in earnest, it took no time at all for him to become completely hard once more. He was feeling not only incredibly sensitive, but was also completely willing to allow himself to experience the pleasure that Tao was offering him. His head tipped back and his lips parted in a mixture of a growl and a moan that resonated deep in his chest. "That's - amazing."